Richtmyer-Meshkov Experiments on the Omega Laser |
| |
| Authors: | R M Hueckstaedt S H Batha M M Balkey N D Delamater J R Fincke R L Holmes N E Lanier G R Magelssen J M Scott J M Taccetti C J Horsfield K W Parker S D Rothman |
| |
| Institution: | (1) Los Alamos National Laboratory, Los Alamos, NM, USA;(2) Atomic Weapons Establishment, Aldermaston, UK |
| |
| Abstract: | Observations of the interstellar medium reveal a dynamic realm permeated by shocks. These shocks are generated on a large
range of scales by galactic rotation, supernovae, stellar winds, and other processes. Whenever a shock encounters a density
interface, Richtmyer-Meshkov instabilities may develop. Perturbations along the interface grow, leading to structure formation
and material mixing. An understanding of the evolution of Richtmyer-Meshkov instabilities is essential for understanding galactic
structure, molecular cloud morphology, and the early stages of star formation. An ongoing experimental campaign studies Richtmyer-Meshkov
mixing in a convergent, compressible, miscible plasma at the Omega laser facility. Cylindrical targets, consisting of a low
density foam core and an aluminum shell covered by an epoxy ablator, are directly driven by fifty laser beams. The aluminum
shell is machined to produce different perturbation spectra. Surface types include unperturbed (smooth), single-mode sinusoids,
multi-mode (rough), and multi-mode with particular modes accentuated (specified-rough). Experimental results are compared
to theory and numerical simulations. |
| |
| Keywords: | HEDLA hydrodynamics instabilities |
| 本文献已被 SpringerLink 等数据库收录！ |
|
